Okay, so when I was younger I would watch WAM videos like all the time. Being young, I didn't enjoy any part of it that involved sex (despite being pubescent, but I didn't masturbate until like 16 anyway.) I simply enjoyed seeing the slapstick feel and how happy-embarrassed and hysterical people were about getting pied or slimed. I kept it a secret to my mom until I went on a Nickelodeon cruise and finally got my first pie and sliming. Obviously before the trip she had to know I was interested in it, so around that time I told her about it. Of course, I watched Nickelodeon a lot as a kid so it came naturally. She never reprimanded me for it, and never has. To this day she just sees it as a quirk, something weird I do but not taboo. This was basically the only time I told mom about my interest as a kid, besides bits of slipping. It was basically a taboo topic because of how weird it was to me. Since childhood, I've kept it somewhat secret, never really revealing it without complete comfort. Even the mention of the word "pie" made me be a shaky, because I would always think of WAM and still do.

At 16, it truly became a fetish, as expected. Childhood love of pie, slime, etc. grew into me being sexually attracted to any application of food on the body. I started my usually teenage delving into Pornhub, xvideos, etc. Now that I'm 18 I start to sign up for sites like umd, join obscure Yahoo groups like WAM Anime Funland, etc. However, it still is a taboo subject for me, and not just because it's related to sex. I enjoy "casual WAM" too, AKA the non-sexual and simply "playful" elements of WAM. Despite it being both a playful and fetish-related subject that I really enjoy, I'm nervous with applying it outside of sites like this one and my few WAM groups. About two years ago I made a character in Warcraft that sells pies and pies herself in comedic fashion. I'm thinking of "reviving" her nowadays, but I'm still nervous of both online and offline references to my fetish.

How do I get over this fear of "taboo WAM"?
Too Long; Didn't Read version
WAM is taboo to me, and I have a problem with expressing my love for it outside of WAM communities without being directly asked. How can I get over this fear?

Short answer, get older and gain more self confidence...
Long answer, there are very few places where you are going to need to express your love of WAM, so don't sweat it. It'll be something you maybe bring up with your serious sexual partners, a close friend or two, and communities such as this one. It'll get easier to distinguish where it is appropriate to talk about the older and more experienced with life you get.

The first thing to realize is that you're not that unusual. If you don't believe me, take a look at this study which was done of 1500 canadians:

Kinky Sex Survey Finds Everybody's Weird

Pretty much everyone in that study expressed some form of deviant sexual desire.

If you're like to get a better idea of the full spectrum of stuff people like, take a look at the map of sexual fetishes I've linked here. You can find ours west of the Great Barrier Mountains and north of cosplay.

Map of Human Sexuality

The reason you find it difficult to talk about is the same reason sex in general is not a topic people talk about. It's personal, individual, and something people are self conscious about. As a result, you'll probably only ever really talk about it with good friends and sexual partners i.e. people you trust.

It's kind of like taking a shit. Everyone does it, but if someone brought it up in conversation, you'd probably think they're a bit odd. It's not that their shitting is particularly strange, it's that their bringing it up in conversation is strange.

I would suggest that the taboo nature of WAM is part of its appeal. Isn't the fact that you're meant to have grown out of this stuff after you were a teenager watching the various TV shows featuring gunge part of the fun? It is, in many ways, about not growing up or just doing silly things in order to relieve the stresses of daily life and have a laugh or a joke (and anything else that comes along with it).

In the end, nobody has to know what you're into. You don't have to shout it from the rooftops or "come out" to friends about it. It's all about you, not other people, and if you're more secure keeping your interests to yourself, then there's nothing wrong with that.

I agree with many of the other posters...as you get older, it won't concern you as much. You'll know a lot of things about a lot of other people that are much worse.

The real reason I'm replying, though, is that I'm curious: When someone is pied in WoW, is there an animation? Do you see something, or is it a text-only thing?

No, this would be 100% roleplaying through text.

Although, OP, if you enjoy that, you could probably find someone to ERP with you in Goldshire on Moonguard.

Consider finding your local kink/BDSM community, starting with happy hours called "munches". Don't assume you will find someone with the exact same interests, but you will likely find people who are at least tolerant, if not curious - as long as you return the favor.

If nothing else, you can learn how to do the bondage elements for "tie & pie" scenarios more safely.

My first time being sploshed by someone else was when a friend from the munches invited me to a play party she and her husband were hosting. While she wasn't specifically into WAM, she enjoyed the dominant-submissive aspect of playing with me.

No guarantees what will happen, but you will at least be among people who are more open-minded about what has the potential to turn someone on...